Humboldt City Of STP
Humboldt, IA · Humboldt County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 2.7 MGD
- NPDES permit
- IA0047791
- Effective
- Permit expires
- October 2030
- Population served
- 4,568
- CWNS 2022
Humboldt City Of STP is a publicly owned wastewater treatment works in Humboldt, Humboldt County, Iowa, serving about 4,568 residents. Treatment on site includes clarifiers, uncovered lagoons. It discharges under NPDES permit IA0047791 (effective), which expires in October 2030, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 1
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
2 verified contacts for Humboldt City Of STP, with validated emails and direct phone numbers.
Unlock 2 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Humboldt City Of STP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Iowa
Dakota City · 2 mi away
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Rutland · 5 mi away
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Badger · 7 mi away
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Thor · 9 mi away
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Clare · 11 mi away
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Bode · 12 mi away
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Livermore · 12 mi away
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Gilmore City · 12 mi away
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Humboldt City Of STP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 11, 2026.